Apple has constantly improved the iPhone camera's overall quality over the years, and this time is no different. It has touted iPhone 5S's larger sensor (1/3.0", compared to 1/3.2" in iPhone 5) that results in bigger pixels (1.5 microns instead of 1.4) and brighter lens (f/2.2 instead of f/2.4) that lets more light in. These are supposed to gather 33% more light, and low-light performance would be improved as such. One thing not mentioned is the focal length. Both devices are fixed to 4mm, but 35mm equivalent values are different - iPhone 5 is 33mm, while iPhone 5S is 30mm. This means the latter has a slightly wider field of view.

iPhone 5's camera already takes great outdoor shots, so I felt that improvements from these upgrades would be most noticeable in indoor shots. Therefore, I decided to use both iPhone 5 and 5S to take several comparison photos in the house, with iOS version both at 7.0.2. First one shown here is taken in a brightly lit room, and the low ISO value tells you that the sensors should be subject to minimal noise. This should be typical of the photos that were taken with good lighting. You can see that both phones perform similarly, but iPhone 5S does apply slightly more smoothing. This makes the 5S photos in good lighting conditions look a little too clean. Fortunately, the details are mostly there and the file size did get a bit smaller on average as a result. This seems to be more or less the difference in post-processing pattern than the sensor performance itself.

When the lighting is dramatically reduced, the difference in sensor performance becomes evident. The photos here were shot with identical ISO and shutter values, yet iPhone 5S's photo preserves the details of the objects and letters much more than iPhone 5's. You can make out the letters with 5S, while 5 gives you muddled goo. Both had noise reduction kicked in, but it iPhone 5 clearly had less detail to work with in the first place. Apple's efforts are paying off here.

Of course, camera module itself is only half the story. Let's take a look at a photo in even worse lighting and go from there.

This photo is shot in a lighting condition that is at about the limit of what default camera app can take. Here, iPhone 5's photo maxes out the ISO value to 3200. Yet, it's slightly darker than iPhone 5S's effort with ISO 2500 and details are even worse. That 33% more light is doing a tangible job for 5S. Still, it's too dark to be useful. Let's turn the flash on.

Taking photos with flash reveals another improvement that iPhone 5S is equipped with - True Tone flash. This is a two-lamp solution with a white and an amber flash that tries to accurately deliver colours of the subjects instead of making it all pale. iPhone 5's single white flash understandably gives you cold, pale tones, while iPhone 5S gives you a warmer, more natural tone. 5S looks better, but how is this compared to having a proper light source?

Even under the cool fluorescent lighting, the subjects don't look as pale as what iPhone 5 took with the flash. In fact, 5S's flash did a closer job, as the lid and the almonds tell you. Again, under better lighting conditions, the two devices give you similar tone and details.

I can say that Apple was successful in taking an already good camera and made it meaningfully better with iPhone 5S. People who upgrade will enjoy better flash, enhanced low-light performance, and even a bit smaller photo size. Now that this is out of the way, I should be taking a look at some new hardware in the phone.

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Over the past 30 days of using the iPhone 5S, I've written several reviews of the phone on various aspects, as one of the first person to use it in Korea. I believe all the major points have been covered, and since the phone has been officially released i